【摘要】 结合当下流行的数据采集和虚拟仪器技术,采用G语言和Lab VIEW IDE对通信系统中的解调系统进行了软件无线电设计。对本地文件中已有的已调信号以及外部通用数据采集卡采集的调幅和调频信号进行解调和分析,对调频信号的解调提出了一种软件脉冲均值标记滤波算法,该算法可以很好地实现调频波的解调。本系统还可以对实时信号波形数据进行保存、打印和对历史信号的回放。该系统彰显了数据采集技术和虚拟仪器技术在无线电领域的应用优越性。更多还原

【Abstract】 Combining with data acquisition and virtual instrument, this paper makes a design of demodulation system with software radio technology, by using G language and Lab VIEW IDE. Based on demodulation and analysis on AM and FM signal collected by data acquisition card, and modulated signal in local machine, a pulse mean marker filtering algorithm is proposed to demodulate FM signal. Besides that, the soft radio system has some other functions such as printing and saving real-time signal,playback of historical signal. The soft radio system designed in this paper shows the superiority of data acquisition technology and virtual instrument technology in the radio domain.更多还原